<template>
    <div class="todo-header">
        <input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" @keyup.enter="add"/>
    </div>
</template>

<script>
import {nanoid} from "nanoid"

export default {
    name:"MyHeader",
    data(){
        return {
            title:""
        }
    },
    methods:{
        add(){
            //输入为空不能执行add操作
            if(!this.title.trim()){
                return;
            }
            //将用户的输入包装成为一个todo对象
            const todoObj ={
                id:nanoid(),
                title:this.title,
                done:false
            };
            //调用父组件app传来的方法,通知app组件去添加一个todo对象
            this.addTodo(todoObj);
            //置空输入框
            this.title = "";
        }
    },
    props:["addTodo"]
}
</script>

<style scoped>
    /*header*/
    .todo-header input {
        width: 560px;
        height: 28px;
        font-size: 14px;
        border: 1px solid #ccc;
        border-radius: 4px;
        padding: 4px 7px;
    }

    .todo-header input:focus {
        outline: none;
        border-color: rgba(82, 168, 236, 0.8);
        box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
    }
</style>
